<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list"
            v-for="(goods, index) in cartInfoList"
            :key="goods.id">
          <li class="cart-list-con1">
            <input type="checkbox"
                   name="chk_list"
                   :checked="goods.isChecked == 1"
                   @change="updateChecked(goods,$event)">
          </li>
          <li class="cart-list-con2">
            <img v-lazy="goods.imgUrl">
            <div class="item-msg">{{goods.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{goods.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)"
               class="mins"
               @click="handler('mins', -1, goods)">-</a>
            <input autocomplete="off"
                   type="text"
                   :value="goods.skuNum"
                   minnum="1"
                   class="itxt"
                   @change="handler('change', $event.target.value*1, goods)">
            <a href="javascript:void(0)"
               class="plus"
               @click="handler('add', 1, goods)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{goods.skuPrice*goods.skuNum}} 元</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none"
               class="sindelet"
               @click="removeGoods(goods.skuId)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll"
               type="checkbox"
               :checked="isAllChecked&&cartInfoList.length > 0"
               @change="updateCheckedAll($event)">
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none"
           @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}} 元</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn"
                       to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
// 通过辅助函数mapGetters -->拿到购物车列表数据
import { mapGetters } from 'vuex'

export default {
  name: 'ShopCart',
  mounted() {
    // 挂载完毕，执行一次，发送请求获取个人购物车数据
    this.getData()
  },
  methods: {
    // 获取个人购物车数据
    getData() {
      this.$store.dispatch('getCartList')
    },
    // 修改商品的购买数量
    async handler(type, updateNum, goods) {
      // type：区分三个元素【mins, change, add】
      // updateNum： +【变化量 1】    -【变化量 -1】    input【最终的个数，而不是变化量】
      // goods：哪一个商品【身上有id】

      switch (type) {
        case "add":
          updateNum = 1
          break
        case "mins":
          updateNum = goods.skuNum > 1 ? -1 : 0
          break
        case "change":
          // 用户输入进来的最终值，非法的【带有汉字】 --->带给服务器数字
          if (isNaN(updateNum) || updateNum < 1) {
            updateNum = 0
          } else {
            updateNum = parseInt(updateNum) - goods.skuNum
          }
          break
      }

      // 派发action --->发送请求
      try {
        // 请求发送成功
        await this.$store.dispatch('addOrUpdateToCart', { skuId: goods.skuId, skuNum: updateNum })
        // 刷新数据
        this.getData()

      } catch (error) {
        console.log(error);
      }
    },
    // 删除商品
    async removeGoods(skuId) {
      try {
        await this.$store.dispatch('deleteCart', skuId)
        // 重新获取数据
        this.getData()
      } catch (error) {

      }
    },
    // 修改商品勾选状态
    async updateChecked(goods, event) {
      // 如果 event.target.checked为true --->令checked = 1    否则 --->令checked = 0
      try {
        // 成功
        let isChecked = event.target.checked ? "1" : "0"
        await this.$store.dispatch('updateChecked', { skuId: goods.skuId, isChecked })
        // 获取一次数据
        this.getData()
      } catch (error) {
        console.log(error)
      }
    },
    // 修改全部商品的勾选状态
    async updateCheckedAll(event) {
      try {
        let checkedAll = event.target.checked ? '1' : '0'
        // 派发action
        await this.$store.dispatch('updateCheckedAll', checkedAll)
        this.getData()
      } catch (error) {
        console.log(error)
      }
    },
    // 删除全部选中的商品
    async deleteAllCheckedCart() {
      try {
        await this.$store.dispatch('deleteAllCheckedCart')
        this.getData()
      } catch (error) {
        console.log(error)
      }
    }
  },
  computed: {
    ...mapGetters(['cartList']),
    cartInfoList() {
      return this.cartList.cartInfoList || []
    },
    // 计算总价
    totalPrice() {
      let sum = 0
      this.cartInfoList.forEach(item => {
        sum += item.skuPrice * item.skuNum
      });
      return sum
    },
    // 判断底部复选框是否勾选【全部商品都选中，才勾选】
    isAllChecked() {
      // every也是遍历数组，判断每个isChecked 是否等于1 --->是：true，  否：false 
      return this.cartInfoList.every(item => item.isChecked == 1)
    }
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 15%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 11.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>